/Engine/Plugins/Animation/IKRig/Source/IKRig/Public/Rig/IKRigSkeleton.h
Get indices of bones in this chain, ordered from tip to root. returns false if chain is invalid.
bool ValidateChainAndGetBones ( const [FBoneChain](API\Plugins\IKRig\Rig\FBoneChain) & Chain, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & OutBoneIndices ) const